With enough credits to graduate, Jeff contemplates his future. The study group once again is faced with the darkest timeline.
Convinced that the study group was destined to meet, Abed pieces together everyone's past revealing that their lives have always been intertwined. Chang tries to destroy Greendale once and for all.
Annie and Shirley try to bring Leonard down. Troy and Abed re-enact a scene from a body switching film.
Annie invites Professor Cornwallis to Jeff's holiday party in the hope of getting on his good side; when the friends learn Cornwallis intends to give them a bad grade, they decide to take decisive action.
When the study group's balloon ride crashes in the wilderness, the friends encounter a mountain man.
Britta plans a Sophie B. Hawkins dance to compete with Dean Pelton's Sadie Hawkins dance.
Jeff, Britta and Annie help Dean Pelton recruit a wealthy potential student; Abed starts a fraternity; Troy and Shirley attend a physical education class.
Dean Pelton asks the study group to help secure a grant for research into Chang's memory loss, while Abed films their efforts for a documentary.
The study group goes to Shirley's house for Thanksgiving dinner; Jeff reunites with his father, who he hasn't seen since he was young.
The study group starts its European history class with professor Noel Cornwallis (Malcolm McDowell); Dean Pelton is upset when Chang returns to campus.
The study group goes to the annual Inspector Spacetime Convention; Annie enjoys the luxuries of the hotel; Jeff spends time with an Inspector Spacetime fan (Tricia Helfer) in the bar.
On Halloween, Pierce accidentally locks himself in his panic room, forcing the gang to search through his house to find the code that unlocks the door.
Jeff competes to earn the group places in the over-booked 'History of Ice Cream' class, while Abed struggles with the inevitable end of their time at Greendale, causing him to enter a 'happy place' in his mind showing bizarre alternative versions of Greendale. Annie and Shirley pull pranks around the school.